EP4556584A1 - Granulés non cuits pour réduction et leur procédé de fabrication - Google Patents

Granulés non cuits pour réduction et leur procédé de fabrication Download PDF

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Publication number
EP4556584A1
EP4556584A1 EP22953911.9A EP22953911A EP4556584A1 EP 4556584 A1 EP4556584 A1 EP 4556584A1 EP 22953911 A EP22953911 A EP 22953911A EP 4556584 A1 EP4556584 A1 EP 4556584A1
Authority
EP
European Patent Office
Prior art keywords
fired pellets
mass
mgo
sio
concentration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22953911.9A
Other languages
German (de)
English (en)
Other versions
EP4556584A4 (fr
Inventor
Kenta Takehara
Tetsuya Yamamoto
Takahide Higuchi
Yuji Iwami
Shohei Fujiwara
Yuya Morita
Kenya HORITA
Toshiyuki Hirosawa
Daisuke Igawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP4556584A1 publication Critical patent/EP4556584A1/fr
Publication of EP4556584A4 publication Critical patent/EP4556584A4/fr
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/008—Use of special additives or fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105—Rotary hearth-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to non-fired pellets for reduction that can be effectively used in a solid reduction furnace, and a method for producing the same.
  • non-fired pellets are often used in solid reduction furnaces represented by shaft furnaces. This is because CO 2 is unavoidably generated in a firing process during the typical operation of fired pellets. However, this is undesirable from the perspective of reducing CO 2 emissions. Thus, the use of non-fired pellets is attracting attention.
  • Patent Literature 1 proposes a method for covering the surfaces of pellets with, for example, Ca(OH) 2 or Mg(OH) 2 .
  • Patent Literature 2 proposes a method for preventing reduction-degradation and obtaining a fired pellet with fewer blisters by covering the surface of sintered agglomerated ore (pellet) with a powdery solid fuel.
  • Patent Literature 3 is directed to prevent the occurrence of clustering in a solid reduction furnace as well as reduce heat loss and improve the operation efficiency by covering the surface of a fired pellet with iron ore mixed with cement.
  • Patent Literature 4 proposes a method for performing covering with a material containing a calcium-iron compound represented by CaxFeyOz (1 ⁇ y/x ⁇ 2; 1 ⁇ z).
  • an object of the present invention is to propose, in producing non-fired pellets for use in a solid reduction furnace, non-fired pellets that is effective in preventing clustering by reducing the possibility of contact between low-melting-temperature slags and thus preventing the fusion between the slags, and a method for producing such non-fired pellets.
  • non-fired pellets for reduction of the present invention may include the following feature that is considered to be able to provide a more preferable embodiment.
  • the production method according to the present invention involves the use of a high-LOI raw material formulated as an iron-containing raw material, causing the obtained non-fired pellets to be porous.
  • a high-LOI raw material formulated as an iron-containing raw material
  • the possibility of contact between the metallic irons can be reduced, thereby effectively preventing clustering and increasing the operation efficiency of a solid reduction furnace.
  • Fig. 1 is a graph illustrating the relationship between (Al 2 O 3 +MgO+SiO 2 )/T.Fe and LOI of Australian iron ore that is an iron-containing raw material to be mixed.
  • a solid reduction furnace used in the present invention is a furnace for reducing fed non-fired pellets for reduction to Fe having a reduction degree of 90% or more by using a hydrogen gas, etc., as a reducing gas .
  • the properties of raw material fed into the furnace, that is, the non-fired pellets are important.
  • the non-fired pellets for reduction have a component composition such that the high-viscosity slag components (Al 2 O 3 +MgO+SiO 2 ) are contained in a given ratio relative to the total iron (T.Fe) in the iron-containing raw material. That is, when the non-fired pellets satisfy the relationship of Expression (1) below. Al 2 O 3 + MgO + SiO 2 / T . Fe ⁇ 0.12
  • Al 2 O 3 represents the concentration (mass%) of Al 2 O 3 in the non-fired pellets for reduction.
  • MgO represents the concentration (mass%) of MgO in the non-fired pellets for reduction.
  • SiO 2 represents the concentration (mass%) of SiO 2 in the non-fired pellets for reduction.
  • T.Fe represents the total Fe concentration (mass%) in the non-fired pellets for reduction.
  • Al 2 O 3 represents the concentration (mass%) of Al 2 O 3 in the non-fired pellets for reduction.
  • MgO represents the concentration (mass%) of MgO in the non-fired pellets for reduction.
  • SiO 2 represents the concentration (mass%) of SiO 2 in the non-fired pellets for reduction.
  • T.Fe represents the total Fe concentration (mass%) in the non-fired pellets for reduction.
  • the total Fe in the iron-containing raw material refers to the total value of the iron concentrations including the concentrations of metallic iron (M.Fe) and iron compounds (iron oxide, iron sulfide, calcium ferrite, etc.).
  • the high-viscosity slag components refer to the total value of the concentrations of Al 2 O 3 , MgO, and SiO 2 contained in the iron-containing raw material, such as iron ore or ironmaking dust; an auxiliary material (limestone, quicklime, dolomite, etc.); and a binder (bentonite, etc.).
  • the method for producing the non-fired pellets according to the present invention will be described.
  • the non-fired pellets for reduction according to the present invention in order for the non-fired pellets to satisfy the above relationship between the high-viscosity slag components (Al 2 O 3 +MgO+SiO 2 ) and the total iron (T.Fe), for example, it is possible to use an iron ore originally having a composition of components satisfying the above relationship, or to selectively use and mix a plurality of iron ores to satisfy the above relationship.
  • iron ores (A to Z) shown in Fig. 1 which are Australian iron ores, may be mixed, followed by granulation with a binder, such as bentonite, and an auxiliary material, such as quicklime, added thereto as appropriate.
  • the iron-containing raw material in order for the iron-containing raw material to achieve the relation LOI ⁇ 5%, it is preferable to apply a pretreatment such as a process for removing crystal water to the iron ore to be used in advance so as to achieve LOI ⁇ 2%.
  • a pretreatment such as a process for removing crystal water to the iron ore to be used in advance so as to achieve LOI ⁇ 2%.
  • the Examples show how the relationship between T.Fe and high-viscosity slag components (Al 2 O 3 +MgO+SiO 2 ) in non-fired pellets for reduction affects the clustering in a solid reduction furnace.
  • iron-containing raw material i.e., iron ore used herein
  • auxiliary material and reagent e.g., commercially available Al 2 O 3 reagent
  • non-fired pellet were produced by adding 5 mass% cement to obtain predetermined components, grinding the mixture with a ball mill, granulating the resultant with a pelletizer while adding water to achieve a size of 9 to 16 mm, and then curing the resultant for two weeks.
  • All raw materials including one or more types of the Australian raw materials (A to Z shown in Fig. 1 ) described above and having the compositions shown in Table 1 were ground in a ball mill and granulated with a pelletizer while adding water to achieve a size of 9 to 16 mm. Then, the obtained non-fired pellets after granulation were cured for two weeks to produce the final non-fired pellets. Each of the obtained non-fired pellets shown in Table 1 was evaluated using a clustering index.
  • a sample weighing 500g was fed into a vertical cylindrical furnace with a diameter ⁇ of 100 mm and heated to 1000°C in an N 2 atmosphere.
  • a reducing gas was introduced into the furnace at a rate of 24 NL/min.
  • the sample was then loaded at a rate of 1 kg/cm 2 and held in this state for three hours, followed by cooling in an N 2 atmosphere, so that reduced iron was produced.
  • the reduced iron obtained was then sieved through a 16 mm sieve mesh, which is the maximum size of a single non-fired pellet, to measure the weight Wa (g) of the non-fired pellets remaining on the sieve.
  • the non-fired pellets remaining on the sieve were put into a cylindrical shape vessel (132 mm ⁇ ⁇ 700 mmL) of an I-type testing machine and were rotated at a rotational speed of 30 rpm for five minutes, to measure the weight Wb (g) of the non-fired pellets remaining on the sieve mesh of 16 mm.
  • the non-fired pellets were evaluated based on a clustering index that is proportional to the non-crushing clustering proportion Wb/Wa.
  • the porosity of the non-fired pellets was evaluated by measuring the apparent density of the pellets and then measuring the real density of the pellets. As shown in Table 1, it is confirmed that each of the non-fired pellets of Examples 1 to 6 in which (Al 2 O 3 +MgO+SiO 2 )/T.Fe is 0.12 or more has a clustering index of 15 or less, and thus has excellent properties.
  • Table 2 shows the component composition of the non-fired pellets obtained in Examples 1 and 2 of Table 1.
  • [Table 2] (mass%) T.Fe FeO SiO 2 CaO Al 2 O 3 MgO C/S
  • Example 1 59.9 0.2 4.1 4.4 2.7 0.6 0.4
  • Example 2 57.7 0.4 5.8 6.0 2.3 0.5 0.6
  • Reduced iron (a sample when Wa was measured) obtained by the same method as the method of Comparative Example 2 shown in Table 1 (clustering evaluation test) of Embodiment 1 was ground into particles with a size of 3 mm or less. Then, the obtained particles were mixed with the unfired raw material of Comparative Example 2. The mixture was used to produce non-fired pellets by the method of Embodiment 1. Then, after the non-fired pellets were cured for two weeks, the crushing strength of the resulting non-fired pellets was measured.
  • M.Fe metallic iron contained in the reduced iron.
  • reduced iron containing M.Fe 78 mass% was used.
  • reduced iron containing M.Fe 80 mass% was used.
  • mixing M.Fe with the raw material can increase the strength of the resulting pellets. Since clustering is promoted as the amount of powder increases, it is possible to suppress clustering by increasing the strength of the non-fired pellets.
  • the reason why mixing M.Fe with the raw material can increase the strength of the resulting non-fired pellets is considered as follows.
  • the unit “L” of volume represents 10 -3 m 3 .
  • Symbol “N” added to the unit of the volume of a gas represents the volume of the gas in the standard state, that is, at a temperature of 0°C and a pressure of 101325 Pa.
  • the unit “rpm” of a rotational speed represents the number of rotations per min.
  • the non-fired pellets for solid reduction according to the present invention are the method that has been developed to be mainly applied to a hydrogen-based direct reduction process.
  • such non-fired pellets can also be used as a raw material for use in a blast furnace, etc.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP22953911.9A 2022-08-01 2022-08-01 Granulés non cuits pour réduction et leur procédé de fabrication Pending EP4556584A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/029419 WO2024028920A1 (fr) 2022-08-01 2022-08-01 Granulés non cuits pour réduction et leur procédé de fabrication

Publications (2)

Publication Number Publication Date
EP4556584A1 true EP4556584A1 (fr) 2025-05-21
EP4556584A4 EP4556584A4 (fr) 2025-11-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22953911.9A Pending EP4556584A4 (fr) 2022-08-01 2022-08-01 Granulés non cuits pour réduction et leur procédé de fabrication

Country Status (4)

Country Link
US (1) US20260043102A1 (fr)
EP (1) EP4556584A4 (fr)
CN (1) CN119630820A (fr)
WO (1) WO2024028920A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1508037A1 (de) * 1966-09-06 1969-09-25 Kokan Mining Co Ltd Verfahren und Vorrichtung zum Herstellen oxydierter und reduzierter eisenhaltiger Kuegelchen
JPS5466314A (en) * 1977-11-08 1979-05-28 Nippon Steel Corp Manufacture of reduced pellets
JPS5910411A (ja) 1982-07-09 1984-01-19 Toshiba Corp マンドレルミルの肉厚制御方法
JPS6237325A (ja) 1985-06-27 1987-02-18 Nippon Kokan Kk <Nkk> 焼成塊成鉱およびその製造方法
JPH0826416B2 (ja) 1987-04-21 1996-03-13 株式会社神戸製鋼所 耐クラスタリング性に優れた直接製鉄用または溶融還元製鉄用製鉄原料
JP2003183716A (ja) * 2001-12-13 2003-07-03 Nippon Steel Corp 回転床炉を用いた還元鉄製造方法
JP2012062505A (ja) * 2010-09-14 2012-03-29 Kobe Steel Ltd 塊成物の製造方法
JP5498919B2 (ja) * 2010-11-15 2014-05-21 株式会社神戸製鋼所 還元鉄の製造方法
JP6724678B2 (ja) 2015-12-25 2020-07-15 日本製鉄株式会社 還元用原料及び還元用原料の製造方法

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Publication number Publication date
US20260043102A1 (en) 2026-02-12
AU2022472679A1 (en) 2025-02-20
WO2024028920A1 (fr) 2024-02-08
CN119630820A (zh) 2025-03-14
EP4556584A4 (fr) 2025-11-26

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